Markdown Version | Session Recording

Session Date/Time: 13 Jan 2026 15:00

SCHC

Summary

The SCHC Working Group held its first interim meeting of 2026. Key discussions included the progress of several drafts, with a strong focus on moving the RFC 8824 Update and the SCHC Protocol Number drafts towards completion. A Working Group Last Call was decided for the RFC 8824 Update. The new "Chiclet" draft, proposing a modular approach to SHIC functionality, was introduced and will be proposed for Working Group adoption. The group also discussed the status of other drafts and the logistics for IETF 125.

Key Discussion Points

• Welcome and Notewells: The meeting started with standard IETF notewells and a reminder regarding IPR.
• Progress of SCHC Protocol Number Draft (v06):
  • The draft progressed from version 04 to 06, incorporating reviews from Carles, Marco, and Pascal.
  • A request for a code point for CCSDS at IANA for the "IP extension" was incorporated, with text provided by Marc Blanchet.
  • Pascal noted the need for more reviews to safely complete the Working Group Last Call (WGLC), specifically mentioning Quentin, Marion, and Laurent.
  • A significant concern was raised regarding the UDP port number's explanation and justification. Pascal stressed the need for clearer text on its purpose, usage (e.g., in multi-session scenarios, or interaction with multi-point compression), and why it is required for transport layer stakeholders.
  • Alexander agreed to review the UDP port number section more closely.
• Progress of RFC 8824 Update Draft:
  • Marco reported a new version (dated December 1st) addresses the two remaining actions from the Montreal meeting.
  • The authors believe the document is ready for WGLC. Marco also suggested informing the CoRE Working Group due to the document's topic.
  • The chairs agreed to initiate a WGLC.
  • The group acknowledged the need to find a shepherd for the document; Carles was suggested, but concerns were raised as he is an author of the draft. No immediate shepherd was identified.
• ICMPv6 Compression Document:
  • The document has expired.
  • Action was identified to contact the authors (Laurent and Dominique) to resubmit a new version so that a WGLC can be initiated.
• SCHC over PPP Draft:
  • The draft is currently on hold, awaiting progression and stability of the main SCHC architectural document to ensure proper alignment, particularly concerning the proposed PPP code for SHIC session indication.
• SCHC Architecture Document:
  • Reference was made to a "minimum architecture" document by Mario and Quentin (who were not present at this interim).
  • Discussion was held on how to advance this work, with suggestions for a "tiger team" or "design team" for concentrated effort.
  • It was noted that there weren't enough participants on the call to make a definitive decision, and the item would be added to the agenda for the next meeting.
• IETF 125 (Shenzhen) Participation:
  • The chairs inquired about in-person attendance for IETF 125. Most participants indicated they would not be attending in person, with Marco planning to attend online.
  • The chairs decided to send an email to the working group to formally gauge participation interest for organizing hybrid attendance.
• Chiclet Document (New Draft v2):
  • Alexander presented the "Chiclet" document, which now includes Marion and Quentin as co-authors.
  • Concept: Chiclet proposes a formal definition of self-contained, specific SHIC functionality, akin to a "screwdriver" from a "Swiss army knife" – a lightweight, focused part of the full SHIC framework. This concept was motivated by specific needs, such as those from DIA-TSP, for a subset of SHIC functionality.
  • Characteristics: A Chiclet implements a specific SHIC operation, operates with fixed or configurable parameters, and crucially, must be fully interoperable with a full SHIC implementation using its specific configuration.
  • Progress: The draft received positive feedback at IETF 124 in Montreal from industrial participants and a positive review from Quentin on the mailing list.
  • Next Steps: The document is considered straightforward and mature. Alexander suggested it is ready for Working Group adoption. The addition of a YANG definition for Chiclet configuration could be considered if deemed necessary later.
  • Pascal expressed support for adoption, provided active involvement from Marion and Quentin is confirmed, which Alexander affirmed.

Decisions and Action Items

Decisions:

• RFC 8824 Update Draft: The Working Group will initiate a Working Group Last Call (WGLC) for this document.
• Chiclet Draft: The chairs will initiate a call for Working Group adoption for the "Chiclet" draft on the mailing list.

Action Items:

• Alexander:
  • Initiate the Working Group Last Call for the RFC 8824 Update draft.
  • Contact the authors of the ICMPv6 Compression document (Laurent and Dominique) to resubmit an updated version.
  • Review the UDP port number section of the SCHC Protocol Number draft for improved clarity and justification.
• Chairs:
  • Send an email to the Working Group to assess interest and plans for attending IETF 125 in Shenzhen.
  • Add the discussion on advancing the SCHC Architecture document (e.g., forming a tiger team) to the agenda for the next interim meeting.
• Pascal:
  • Initiate the call for Working Group adoption of the "Chiclet" draft on the mailing list.
• Working Group:
  • Individuals are encouraged to provide further reviews for the SCHC Protocol Number draft, especially regarding the UDP port number justification.

Next Steps

• The chairs will proceed with the action items, including initiating WGLCs and calls for adoption as decided.
• The group looks forward to increased participation at the next interim meeting.